autobuild[sn-devel-144]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-24-1830/flakey.log

The failure seems to be in the "samba-ad-dc-5" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-24-1830/samba-ad-dc-5.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-24-1830/samba-ad-dc-5.stdout
  
The top commit at the time of the failure was:

commit 92f30f91e44dba7e85d56279bbbe3662d0b5faeb
Author: Lutz Justen <ljusten at google.com>
Date:   Mon Apr 22 10:22:16 2019 -0700

    waf: build: Respect --disable-python for third_party modules
    
    Skips installation of samba/third_party stuff into the python directory if
    --disable-python is set.
    
    Added test after install that confirms no python modules installed.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13905
    
    Signed-off-by: Lutz Justen <ljusten at google.com>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Apr 24 07:32:31 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

[62(260)/320 at 11m7s] samba4.rpc.lsa on ncalrpc with validate(ad_dc_default:local)
[63(261)/320 at 11m10s] samba4.rpc.dssetup on ncalrpc with validate(ad_dc_default:local)
[64(262)/320 at 11m10s] samba4.rpc.altercontext on ncalrpc with validate(ad_dc_default:local)
smbtorture 4.11.0pre1-DEVELOPERBUILD
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
Using seed 1556123436
opening LSA connection
Testing change of primary context

Testing OpenPolicy2
Testing change of primary context
Opening secondary DSSETUP context
Testing change of primary context
Opening bad secondary connection
Testing DSSETUP pipe operations
dcerpc_dssetup_DsRoleGetPrimaryDomainInformation level 1
dcerpc_dssetup_DsRoleGetPrimaryDomainInformation level 2
dcerpc_dssetup_DsRoleGetPrimaryDomainInformation level 3

Testing Close

Testing change of primary context

Testing OpenPolicy2

Testing Close

Testing change of primary context

Testing OpenPolicy2
UNEXPECTED(failure): samba4.rpc.altercontext on ncalrpc with validate.altercontext(ad_dc_default:local)
REASON: Exception: Exception: ../../source4/torture/rpc/lsa.c:188: status was NT_STATUS_CONNECTION_RESET, expected NT_STATUS_CONNECTION_DISCONNECTED: OpenPolicy2 failed

FAILED (1 failures, 0 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_default)(ad_dc_default) -> 164
samba4.rpc.schannel on ncacn_ip_tcp with seal,padcheck(ad_dc_default) -> 44
samba4.rpc.schannel on ncalrpc with validate(ad_dc_default:local) -> 42
samba4.rpc.schannel on ncacn_np with seal,padcheck(ad_dc_default) -> 36
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD" -k yes --option=clientldapsaslwrapping=plain'(ad_dc_default)(ad_dc_default) -> 32
samba4.rpc.schannel on ncalrpc with seal,padcheck(ad_dc_default:local) -> 32
samba4.drs.rpc.dssync on ncacn_ip_tcp with seal,padcheck(ad_dc_default) -> 26
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD"  --option=clientldapsaslwrapping=plain'(ad_dc_default)(ad_dc_default) -> 25
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD" -k yes --sign'(ad_dc_default)(ad_dc_default) -> 23
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD" -k yes --encrypt'(ad_dc_default)(ad_dc_default) -> 22
ERROR: test failed with exit code 1